Breast-transmitter.



No.853,337. PATENTED MAY 14, 1907. J. A. BIRSPIELD. I

BREAST TRANSMITTER.

APPLICATION FILED FEB. 13, 1905.

2 SHEETS-SHEET 2 -H- fiiifipii UNITED STAEEEHIZATENT OFFICE.

JULES A. BIRSFIELD, OF ROCHESTER, NEW YORK, ASSIGNOR TO STROMBERG-OARLSON TELEPHONE MANUFACTURING COMPANY, OF ROCHES- TER, NEW YORK,A CORPORATION OF NEW YORK.

BREAST-TRANSMITTER.

To all whom it may concern.-

Be it known that 1, Jones A. BIRSFIELD, a citizen of the United States,residing at Rochester, in the county of Monroe and State of New York,have invented a certain new and' useful Improvement in Breast-Trasmitters,

of which the following is a full, ear, con cise, and exact description,reference belng had to the accompanying drawings, forming a part of thisspecification.

My inventionrelates to telephone transmitters and its object is improvedfeatures of construction and improved means for assembling the variousparts and for adjusting them. v

I will describe my invention with reference to an operators breast platetransmitter,

, mitter, casing,'Fig.l 3 is arear view of the transmitter alone, Fig. 4is\an enlarged longitudinal sectional view taken on line 4 4 of Fig. 3,Fig. is a side elevation of an'im proved supporting bridge, Fig. 6 is a'sec tional' view of the supporting bridge alone, taken on line 6-6 ofFig. 3, 'Fig. 7 is a detached detail view taken on line 7 7 of Fig. 3showing the adjustment of inclosing case stampings, Fig. 8 is a detachedview of the transmitter arm, only part of the transmitter mouth piecebeing shown, and Fig. 9 is a secvtional view taken on line 9- 9 of Fig.8.

Like reference characters refer to like parts throughout the variousfigures.-

As shown in Figs. 1 and 2, the transmitter 1 1 is secured to the breastplate 2, which is secured to the rear wall 3 of the transmitter byrivets i, i. j The ends of the breast plate are provided with openings 5and slots 6 leading thereto, and theend pieces 7 of the supporting strip8 are each providedwith a button 9 passing through the correspondingopening? and into the slot 6. The rear wall 3 of t e transmitter ispreferably of aluminium, ts se= cure lightness, and the front wall ofthe trans- Specification of Letters Patent. Application filed February13, 1905- Serial No. 245,527.

Patented May 14, 1907.

mitter consists of an outer stamping 10 and an inner stampin 11. Theflange 12 of the stamping 10 is s 4 ridge 13 and a flange part 14, whilethe stamping 11 is bent to form 'an annular ledge 15, an annularshoulder 16, and a flange part 1-7. The front wall 18 of the stamping11. is straight and provided with a central opening 19. The frontwall 20of the stamping 10 is bent inwardly to form a depression 21, the rearwall 22 of which has'a central opening 23, registering with'the opening19, the rear wall'22 being secured to the front wall 18 of the stamping'11 by means of screws 24 which pass through'both these walls intoengagement with the shoulder'2'3 of aspherical head 26, to be furtherdescribed hereafter;

The shoulder 16 and led e l3'are so adjustedthat upon assembly of t estampings 10 and 11 this shoulder and ledge willengage before the walls18 and 22 come into enga .ement and as thescrews'24are secured, t e twostampings are sprung securely together and .form between them an-annular air chamber 27 The flange part 17 of the stamping 11. is providedwith aplurality ofindentations 28 of such shape as to form longitudinalgrooves 29 and circumferential grooves 30. The

flange 31 of. the rear wall or casing 3 has indentations32 to form lugs33 corresponding in position to the indentationsin the stamping 11. Uponassembly, the lugs 33 are brought.

to the entrance of the longitudinal grooves 29 and upon a slight forwardand rotary motion of the rear wall 3, 'th;e.lugs 33 are "oved into thecircumferential slots and t e. rear "wall is securely held in position.

To lockthe several walls or stampmgs in position, a screw 34 passesthrough the-flanges .14, 31 and 17.

The transmitter diaphragm 35 is provided aped to offer an annularwith aperipheral rubber washer 36 and rests f I against the annular ledge 15of the stamping 11,- "a moisture disk 37 being clamped be tween thediaphragm and the ledge; Afront electrode 38 in the form of gauze issecured tothe diaphragfirand surrounded by-a felt.

ring 39. A cup 40 surrounds the felt ring and carries-the rear electrodei1 mounted-on a stem 42 extending through the cup 40.

The 'comminuted material 43' is .disposed in the-chamber formed by thefront and rear .3 the. felt ring:

Heretofore, it has been customary to em- I the nut 48 is secured. .Thusin place of the.

-{12dpasses through upon'a slight rotary motion t e feet will pass underthe ledges and the arch is thus firmly secured in position. The rearelectrode stem aninsulation Washer 47 is enga ed by a nut '48,andsecurely clamped to tdiesupporting arch. A binding screw 49 securedtothe rear electrode cup 40 passes through the arch wall and is engagedy nuts 50 betweenwhich-Inay be clamped the conductor 51 A bindingscrew52 is se cured to the. arch wall and'is engaged by a conductor 53connected with the diaphragm and by the lead 54." A damping spring/t0rests against the'diaphragmjwhile a damp-- mg spring 41 rests againstthe, rubber Washer 36. These dampingsprings are integral with the.supporting body plate .42 which is heavy supportin bridge heretoforeemployed, I am ena led tosupport the transmitter parts with equallefficiency by the use of a very light and-strongsupporting arch. Aspherical shell 55 receives the spherical head 2.6,whieh is hollow, thespherical shell being pivoted to the head by means of a ivot pin 56passing through the axis of the ead and the shell. This pivotfpin has aknurled end 57 which as the pin is driven into position en ages thespherical shell wall-and se cures the pin therein. The necessar frictionbetween thespherioal shell and sp e'rical head is obtained by means ofaspring'stampy ing 58, which, engages the pivot pin 56 and the annularledge 59 within the spherical head. A cylindrical shell fiflextends fromthe spherical shell. and at its outside is thread- .50 threaded end 62of the mouth plece 63.

locking ring fil'is provided'with a recess 64 at.

ed for-receiving the locking ring 61 and flt lhe e its forward end intowhich the reduced'end piece being prevented therebv from-cracking as thelockm ringH-is'broug t nto engagement therewith. The mouthpiece 63 iscurved upwardly, as sh0wn,'."and may be adjusted by swinging about thepivot 56. The depression 21 in the stampin lflallowssuflicient rotationof the spherica shell swat the head to offer a wide range ofadjustmentof the mouth-piece. I D I thus rovide a transmitter which isof very dura le construction, being-at the same see-gear:

e=='o f the, transmitter frame to the other. .parts an air chamberbetween time li ht and inexpensive, the supporting 'e1ngall shaped so'they may be stamped from sheet material, the locking and securing meansfor the supporting parts be ing inherent in the various parts and formedduring the operation of 'stampingof the parts I As many modificationsmay be made without-departing from the spirit of my invention, I do notwis to be limited to the exact construction as herein shown.

I claim as new and-desire to secure by Letters Patent: i

1. In a telephone transmitter, .the combination with,arear inclosinwall, of a front inclosing wall consisting o flanges extending from saidstampings and a separatedto form an annular groove, and a flangeextendinglfrom' the rear wall for engagement in said annular groove. 1

2-. In a telephone transmitter, the combinationwith a rear supportingwall, of a front supporting well formed of two stampings, an airvchamber between said stampings, a flange extending from each stamping,said flanges being disposed to form an annular groove, and a. flangeextending from the rea'r wall for engagement in said groove;

3. In a telephone transmitter, nation with a rear inclosin inclosing.wallfeonsis'ting o the combi Wall, of a front two stampings, .saidstampings, flanges extending from said sta'mpings and:

'- disposed to forinan annular groove, a flange extending from said rearengagingin said groove, said rear wall flange, and indentations-in oneof said other flanges for receiving said' In s, whereby said front and,rear inclosing wa lls are securedtogether. Y 4. In a telephonetransmitten the combination with a rear inclosing wall, of a frontinclosing wall formed of two stampings, said stampings beinginIc'ontact-at their centers and at their edges'to'leave an air chamber"between them, flanges extending fromsaid stampings and disposed to forman annular groove, a flange extendingfrom the rear in-" closing wall fore aging in said groove, lugs inclosing Wall for extending from saidrearwall flange, and a Inc lugs extending from plurality of grooves inone/of .s'aid' other flanges for receivi ng said lugs,- said groovesextending longitudinally and then 'circ'urn ferentially. p 5. In atelephone transmitter, the-combinationwith a rear supporting wall ofafront wall composed of an outer and innerstamping, the front walls, ofsaid stampi'ngs being separated toleave an air chamber, a flange.

extending rearwardly from each stamping, "said flanges being disposed toform an annul'ar roove, a flange extending'from the rear walfforengaging in said groove, lugs pressed from the rear wall flange, andindentations pressed in the flange of the inner stampingnation with arear inclosing wall, of a front :engagementto leave an annular airchamberbetween the st'am ings, the end flanges of the stampings beingisposed to form an annular groove, a flange extending from the rearinnation with a i' 'jar inclosing wall stamped in-.

closing wall for en aging in said groove, lugs pressed inwardly from therear wall flange, and indentations pressed in the end flange of theinnerstamping to form grooves for the reception of sai lugs, saidgrooves extending longitudinally and then circumferentially for shortdistances.

7. In a telephone. transm tter, the combitegrally from sheet material,of. a front inclosi wall formed of outer and inner cup sha e' stampings,the cylindrical sides of sai stain ings being pressed to form annularledges an end flanges, said stam ings bein adapted for engagement onlyat t eir centrzfi portions and at said annular ledges, wherebyan'fannular air chamber is formed between a the stampings, means :forsecuring the stampings together at the central part there-- of, saidstampings when brought into en agement' at their ledges being separateda gistance at their central parts, wherebyupon securing; said centralparts together said stampings will be sprung to ether, an annu" larroove formed between t e end flanges of sai stamping, a flange extendingfrom the rear incloslng wall for engaging in said roove, lugs re'ssedfrom said rear wall ange, and ink entations pressed in the innerstamping end flange to form grooves for receiving said lugs, s'aidgrooves extending longitudinally a distance, and thencircunrf'erentially a distance, said .lugs' when disposed in saidcircumferential part of the grooves serving the transmitter securelytogether.

.8. In a telephone transmitter, the combiinclosing wall, a flangeextendin rearwardly from the front inclosing wall, provided withindentations to form grooves in the outer'surfaceof the flange, a flangeex tending from the rear inclosing wall provided with lugs for engagingin said grooves,

' an annular ledge formed in said front inclosa sheet metal supportingarch ening wall,

said notches, whereby said arch is secured to said front inclosing wall.

to lock the inclosing walls of aging said annular ledge,;notches formedfietween said ledges and the indentations in 9. In a telephonetransmitter, the conibination with a rear inclosing wall, of a frontinclosing wall, said walls belng stamped interally from sheet material,a flan e extendlng from the front supporting wal indenta- 'tions pressedin said flange to leave grooves in the outer surface thereof, saidgrooves rune nin longitudinally and then circumferentlal y shortdistances, a flangeextending from and rear inclosing walls securelytogether, an annular ledge extending inwardly from/the. foot of thefrontinclosing wall flange} aid -rearwardlyfromthe front wa with indentationsfor form'in rooves in the I outer surface of the front walI ange, aflange extending from therear wall provided with lugs for-engagin insaid grooves, whereby the inclosing'wa ls are secured together,anannular led e extending inwardly from the foot of the frontwall flange,said ledge with the indentations in the front wall flange forming slots,an arch stampedintegrally from sheet. material ,for supportintransmitter parts, and four feet extending rom said arch frame forengaging in said slotsupon a slight turning motion of the arch frame,whereby said arch frame is securely locked to the front inclosing wall.I 11. In a telephone transmitter, the combination with a rear inclosingwall, of a front grally from sheet material, a flange extendingrearwardly from'the front inclosing wall, indentations pressed in saidflange for forming grooves in the outer side of the flange,

from the rear inclosing wall, lugs pressed in said flange for-engagingsaid grooves to lock the inclosing walls together, an annular ledgeextending inwardly from the base of the front wall flange, said ledgewith the'inden-q tations in said front wall flange forming detent slots,an arch frame 4A for supporting transmitter parts, and arms for saidarch, the ends of said arms being adapted. for insertionextendingrearwardly from said wall, indentations pressed in said flange to formlugs at the interior thereof, an annular ledge exthe rear inclosing wallprovided with lugs for 7 5 engaging in said grooves to secure the frontled eforming notches with the indentations 8o grally from sheetmaterial, a-flange extending l, provide inclosin'g, wall, said wallsbeing stamped intesaid grooves being longitudinal and thencircumferential, a flange extending forwardly in said slots to lock thearch to the front in-.

' i I,25 12. In a telephone transmitter, the combr- I 1 I extendingrearwardly from said wall, indensaid body portion bein .tendingrearwardly from said wall, indenta- 1 tions pressed in .said flange forforming d'e-' springs associated'with the diaphragm, said tendinginwardly from thebase of said flange, said ledge with said indentationsforming slots, a frame for supporting transmitter parts, and feetextending fromsa-id frame for engagement in said slots. I i

13. In a telephone transmitter, the combination with a front supportingwall stamped integrally from sheet material, of a flangev tationspressed in saidflange to form detent lugs at the interior thereof, anannular ledge extending inwardly from the base of said flange andforming slots in conjunction with said detent lugs, a supporting archstamped integrally from sheet material for supporting transmitter parts,said arch consisting of a body portion, and armsextending'from said bodyportion for engagement at their ends in said slots, whereby said archmay be securely locked to the front inclosing wall.

14. In a telephone transmitter, the combination'with a front inclosingWall stamped integrally from sheet material, a flange extent lugs at theinterior thereof, an annular: ledge extending'inwardly from the base ofsaid flange and forming slots with said detent lugs, a'supporting framein the shape of an arch stamped integrally from. sheet mate: rial, armsextending from said supporting phragm secured to said front wall infront of the supportingframe, an electrode chamber supported from saidsupporting frame and associated with the diaphragm,fand damping dampingsprings terminating in a body portionand being stamped integrallytherewith,

, g clamped'to said supporting frame. i

15; In a telephone transmitter, the combination'with a front supportingwall, of a hollow spherical head secured thereto, a spherical shell'forreceiving said head, a pivot pin extending through the axes of saidshell and said head, and'a transmitter mouth piece securedto said shell.

16.- In a telephonetransmitter, the combination with a front supportingwall, of a hol low spherical head secured thereto, a spher ical shellfor receiving said head, a pivot pin passing through the axes of saidshell and said head and secured in said shell, friction springmeansengaging said pin and said head, a hollow extension from saidcylindrical head, a'transmitter mouth piece secured to said extension,and a locking ring forlo'cking said mouth piece to said extension.

17. In a telephone transmitter, the combination with a. rear inclosingwall, of afront in'closing wall consisting of an outer and an innerstamping, central openings in said ing through both stampings,

cured together and to said head, and means for locking said rear incl osing wall to said front inclosing wall.

18.. In a telephone transmitter, the combination with a rear inclosingwall, of a front inclosing wall consisting of an outer and an innersheet metal stamping, a central openthe outer stamping her to existbetween said stampings upon as sembly thereof, a transmitter supportingarm extending through said openings, screws for securing said arm,flanges extending rearwardly from w a depression infor caus ng ana1r'cham-- said stampings togetherand to said stampings disposed to formanannular groove for receiving the edge of the rear'in-- closing wall,and means for locking said rear wall Within said groove. t t

19.v In a telephone transmitter, the combination. with a rear inclosingwall, of a front 'inclosing wall consisting of an outer and an innerstamping of sheet .metal, an annular =flange and an annular shoulder foreach stamping, a central depresslon 1n said outer stamping, the walls ofsaid'depression extending rearwardly for engagement with the rearstamping, a central opening through said stampings, a transmittersupporting arm extending into said openings, means upon assembly of saids'tampings for causing the annular shoulders thereof to engage beforeengagement of the walls of the depression with the rear stamping, andscrews passing through said stampings and engaging said causing saidstampings to be sprung together and to be secured to said transmitterarm.

nation with a front inelosing wall composed transmitter arm tighteningof said screws "1 05 20. In a. telephone transmitter, the combi,

of two plates separated about their edges to form an annular groove, ofa rear inclosing wall having its edge engaging in said groove.

21. In a telephone transmitter, the combination wit-h a front inclosingwall composed 'of two plates'separ'ated about their edges to form anannular groove, of a rearinclosing wall having its edge engaging in saidgroove, "and locking means formed of the material of 1 i I the walls forlockingthe rear incloslng wall 1n said groove.

I 22. In a telephone transmitter, the combination with a cup-shapedsupporting frame, an annular interior ledge about the edge of saidframe, inwardly extending lugs punched from the material of the frameabove said ledge to form grooves, and a sheet metal supporting framelocked at its edge in said grooves.

g 23. In a telephone transmitter, the combination with a cup-shapedsupporting frame,

an annular interior ledge about the edge of said frame, inwardlyextending lugs punched [-lar ledge at armsof said frame engaging in saidgrooves" to be'locked to the supporting frame.

24. In a transimtter, the combination with a front cup-shapedlllCl-OSllflg easing, an annutance from the edge thereof, said oasinbeing punched about the edge at various places to leave indentations atthe outside thereof, lugs at the interior thereof above the ledge, anarched sheet metal frame engaging atits ed e between said ledge and saidlugs to be lodlred to the inclosing casing, and a cupshapedrearinclosing casing ,:f engaging at its [edge about the edge of thefront in'closing casing, said rear inclosing casing being punched alongits edge to form lugs at the interior thereof to register with theindentations about the edge of the front inclosing casing.

25. In a transmitter, the combination with afront cup-shaped inclosingcasing, an annuar ledge at the interior of said casing a disance rom theedge thereof, said casing being punched ab out .the edge at variousplaces to leave indentations at the outside thereof, lugs at theinterior thereof above the ledge, an arched sheet metal frame engagingat its edge between said ledge and saidlugs to be locked to. theinclosing casing, and a cup shaped rear inclosing casing engaging at itsthe interior of said casing a disedge about casing, said rear inclosingcasing being punched along its edge to form lugs at the interior thereofto register with the, indentations about the edge of the front inclosingcasing, said indentations about the edge of the front inclosing casii 'gextending longitudinally and circumfe'rentially, the lugs of the rearinclosing casin passing through the 1ongitudinal part and ally engagingin the circumferential part of the indentations to lock the casingstogether. 26. In a telephone transmitter, the combination with 'aninolosing casing containing the transmitter and operative parts, of amouth piece for conveying voice waves to the interior of the casing, aball and socket joint having the ball member secured to the casing andthe socket member secured to the mouth piece and a pivot member passingthrough the ball and socket joint whereby said mouth piece may be movedto assume various angles with respect to the casing, and means forlockin the oint to hold the mouth piece in any a justed position.

'In'witness whereof, I hereunto subscribe my name this 9th day ofFebruary A. D.,

9.05. c JULES A. BIRSFIELD.

Witnesses:

CHARLES J. SCHMIDT, LEONARD W. NovANDER.

the edge of the front inclosing

